Why is it called a cuttlefish if it's not a fish?

Often things are given names at a point in time where our knowledge of them are limited. As we know more (or sometimes just as we define things differently), sometimes these names will seem odd, or unsuitable. Specifically for cuttlefish, a quick ... read more

Specifically for cuttlefish, a quick google search (cuttlefish etymology) showed at the top (without having to click a link to go to a website, just directly in the search results), that it is a combination of the British “cuttle” (which, if you click the link, you can see comes from old English “cudele”, which again comes from old Germanic “codd”, which refers to the ink sack), and “fish”. read more

Cuttlefish have a unique internal shell, the cuttlebone. Despite their name, cuttlefish are not fish but molluscs. Cuttlefish have large, W-shaped pupils, eight arms, and two tentacles furnished with denticulated suckers, with which they secure their prey. read more

indeed, they belong to the phylum molluska so they're invertebrates, where as fish (and all other vertebrates) are in the phylum Chordata and the subphylum verbrata. read more